You must accept that you might fail then if you do your best and still don't win at least you can be satisfied that you've tried. If you don't accept failure as a possibility you don't set high goals you don't branch out you don't try – you don't take the risk.
The best way to predict the future is to invent it.
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Goals provide the energy source that powers our lives. One of the best ways we can get the most from the energy we have is to focus it. That is what goals can do for us concentrate our energy.